Spectral Properties of Locally Pressed Fiber Bragg Gratings Written in Polarization Maintaining Fibers

In this work, we analyze the spectral properties of locally pressed fiber Bragg gratings (FBGs) written into polarization maintaining fibers. We study the evolution of the spectral response of a FBG written into a PANDA fiber when the central region of the grating is perturbed by a diametrical load. Due to the complex structure of the fiber, a finite element model was carried out to determine the strain distributions generated at the center region of the fiber core, and hence taking the induced change in refractive index as the change in effective refractive index due to the applied load. Once the shifting in Bragg wavelength and the optical principal axes of the loaded region are known, a modified transfer matrix method is applied to calculate the spectral response of the FBG. We have found experimentally and by numerical simulations that the reflected spectra for the grating exhibit a narrow and tunable polarization-dependent spectral hole. The tuning of this spectral hole is dependent of the magnitude and the angle of the applied force over the optical fiber.

[1]  Rachid Gafsi,et al.  Analysis of Induced-Birefringence Effects on Fiber Bragg Gratings , 2000 .

[2]  S. G. Grubb,et al.  Fiber gratings in lasers and amplifiers , 1997 .

[4]  R. Stubbe,et al.  Fiber Bragg grating (FBG) characterization and shaping by local pressure , 2001 .

[5]  M Leblanc,et al.  Distributed strain measurement based on a fiber Bragg grating and its reflection spectrum analysis. , 1996, Optics letters.

[6]  S. Vohra,et al.  Transverse load sensing by use of pi-phase-shifted fiber Bragg gratings. , 1999, Optics letters.

[7]  A. Cusano,et al.  Structured Chirped Fiber Bragg Gratings , 2008, Journal of Lightwave Technology.

[8]  Pedro J. Torres,et al.  Spectral response of locally pressed fiber Bragg grating , 2002 .

[9]  W. Marsden.  I and J , 2012 .

[10]  Agostino Iadicicco,et al.  Micro-structured fiber Bragg gratings. Part I: Spectral characteristics , 2007 .

[11]  J. Sirkis,et al.  Effects of diametric load on fibre Bragg gratings fabricated in low birefringent fibre , 1996 .

[12]  S Huang,et al.  Phase-based Bragg intragrating distributed strain sensor. , 1996, Applied optics.

[13]  T. Erdogan.  Fiber grating spectra , 1997 .

[14]  Clinton Randy Giles,et al.  Lightwave applications of fiber Bragg gratings , 1997 .

[15]  P. Laporta,et al.  Fiber strain sensor based on a pi-phase-shifted Bragg grating and the Pound-Drever-Hall technique. , 2008, Optics express.

[16]  Michael A. Davis,et al.  Fiber grating sensors , 1997 .

[17]  S. Campopiano,et al.  Micro-structured fiber Bragg gratings. Part II: Towards advanced photonic devices , 2007 .

[18]  S. Timoshenko,et al.  Theory of elasticity , 1975 .

[19]  J. Barbera,et al.  Contact mechanics , 1999 .

[20]  Martin W. McCall,et al.  Analysis of single and multiple, non-permanent, tunable, birefringent spectral holes in a fibre-Bragg grating stop-band produced via uniaxial pressure , 2003 .

[21]  H J Shaw,et al.  Elasto-optic alignment of birefringent axes in polarization-holding optical fiber. , 1986, Optics letters.

[22]  I Bennion,et al.  Fabrication of multipassband moiré resonators in fibers by the dual-phase-mask exposure method. , 1997, Optics letters.

[23]  John Botsis,et al.  Characterization of the response of fibre Bragg grating sensors subjected to a two-dimensional strain field , 2003 .

[24]  Ralph P. Tatam,et al.  A pressure sensor based upon the transverse loading of a sub-section of an optical fibre Bragg grating , 2007 .